#10314 HIGH Not Tri: XO-1.5 won't boot

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#10314: XO-1.5 won't boot
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           Reporter:  wad       |       Owner:  wad        
               Type:  defect    |      Status:  assigned   
           Priority:  high      |   Milestone:  Not Triaged
          Component:  hardware  |     Version:  1.5-C2     
         Resolution:            |    Keywords:  XO-1.5 boot
        Next_action:  diagnose  |    Verified:  0          
Deployment_affected:            |   Blockedby:             
           Blocking:            |  
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Comment(by wmb at firmworks.com):

 Any chance of decoding the last access in the burst to determine its
 address?

 One thing to consider:  Prior to fetching instructions, the Via chipset
 first reads a 4-byte "SIP pointer" from ROM offset 0xfff80, then a 32-byte
 "SIP" data structure from ROM offset 0xfffd0.  It contains configuration
 values that are used to initialize the GTLPHYs in the host bus driver
 block.

 Sometime after that, the CPU then reads 5 bytes of instruction from ROM
 offset 0xffff0 , then jumps to offset 0xffc30 to begin the early startup
 sequence in earnest.  The first thing that happens at offset 0xfffc30 is a
 write of 0x01 to port 80.

-- 
Ticket URL: <http://dev.laptop.org/ticket/10314#comment:8>
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